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One-way flow control valves GR/GRA, in-line installation
Subject to change – 2019/052 � Internet: www.festo.com/catalog/...
One-way flow control valves GR/GRA, in-line installationProduct range overview and type codes
Product range overview
Version Valve function Version Type Connection
direction
Pneumatic
connection 1
Pneumatic
connection 2
qnN1) Adjustment
component
� Page/
Internet
[l/min]
In-line
installation
Metal
One-way flow
control function
GR/GRA Inline M3, M5, GÁ,
G¼, Gy,
G½, G¾
M3, M5, GÁ,
G¼, Gy,
G½, G¾
29.5 … 3,300 Knurled screw 3
Polymer
One-way flow
control function
GR Inline QS-3, QS-4,
QS-6, QS-8
QS-3, QS-4,
QS-6, QS-8
85 … 265 Knurled screw 11
1) Standard nominal flow rate in direction of flow control.
Type codes
GR – QS-4 – –
Type
GR One-way flow control valve, in-line installation
GRA One-way flow control valve, in-line installation
Pneumatic connection 1 and 2
M3 Female thread M3
M5 Female thread M5
1/8 Female thread Gx
1/4 Female thread G¼
3/8 Female thread Gy
1/2 Female thread G½
3/4 Female thread G¾
QS-3 Push-in connector for tubing O.D. 3 mm
QS-4 Push-in connector for tubing O.D. 4 mm
QS-6 Push-in connector for tubing O.D. 6 mm
QS-8 Push-in connector for tubing O.D. 8 mm
Number of valves
X2 2 one-way flow control valves in one housing
Generation
B B series
2019/05 – Subject to change 3� Internet: www.festo.com/catalog/...
One-way flow control valves GR/GRA, in-line installationTechnical data – Female thread, metal
One-way flow control valve GR/GRA -M- Flow rate
29.5 … 3300 l/min
-Q- Temperature range
–20 … +75 °C
-L- Operating pressure
0.1 … 15 bar
GR-1/4
One-way flow control valve GR-…X2
Two one-way flow control valves are
combined in a housing. This allows
the flow and return speed to be set
separately for single- or double-acting
compact cylinders, for example.
12
-M- Flow rate
95 … 205 l/min
-Q- Temperature range
–20 … +60 °C
-L- Operating pressure
0.5 … 10 bar
General technical data
Valve function One-way flow control function
Type GR-M3 GR-M5-B,
GR-M5X2-B
GR-1/8-B,
GR-1/8X2-B
GR-1/4 GRA-1/4-B GR-3/8-B GR-1/2 GR-3/4
Pneumatic connection 1, 2 M3 M5 Gx G¼ G¼ Gy G½ G¾
Adjusting element Knurled screw
Type of mounting Through-hole – Through-hole
Front panel mounting – Front panel mounting
– In-line
installation
–
Mounting position Any
-H- Note: This product conforms to ISO 1179-1 and to ISO 228-1
Operating and environmental conditions
Type GR-M3 GR-M5-B,
GR-M5X2-B
GR-1/8-B,
GR-1/8X2-B
GR-1/4 GRA-1/4-B GR-3/8-B GR-1/2 GR-3/4
Operating pressure [bar] 0.3 … 8 0.5 … 10 0.1 … 10 0.3 … 15
Operating medium Compressed air to ISO 8573-1:2010
[6:4:4] [7:4:4] [7:–:–] [7:4:4] [7:–:–]
Note on operating/pilot medium Lubricated operation possible (in which case lubricated operation will always be required)
Ambient temperature [°C] –10 … +60 –20 … +60 –20 … +75 –10 … +60
Temperature of medium [°C] –10 … +60 –20 … +60 –20 … +75 –10 … +60
Storage temperature [°C] –10 … +40 –20 … +40 –20 … +75 –10 … +60
Subject to change – 2019/054 � Internet: www.festo.com/catalog/...
One-way flow control valves GR/GRA, in-line installationTechnical data – Female thread, metal
Standard nominal flow rate qnN at 6 bar > 5 bar as a function of spindle rotations n
GR-M3 GR-M5-B, GR-1/8-B
qn
N [l
/min
]
n
GR-M5-B
GR-1/8-B
GR-M5X2-B GR-1/8X2-B
GR-M5X2-B (Regulating screw closed)
GR-M5X2-B (Regulating screw open)
GR-1/8X2-B (Regulating screw closed)
GR-1/8X2-B (Regulating screw open)
2019/05 – Subject to change 5� Internet: www.festo.com/catalog/...
One-way flow control valves GR/GRA, in-line installationTechnical data – Female thread, metal
Standard nominal flow rate qnN at 6 bar > 5 bar as a function of spindle rotations n
GRA-1/4-B GR-3/8-B, GR-1/2, GR-3/4
qn
N [l
/min
]
n
qn
N [l
/min
]
n
Materials
Sectional view
One-way flow control valve
1 Nut GR-M5-B, GR-M5X2-B, GR-1/8-B,
GR-1/8X2-B: Wrought aluminium alloy
GR-1/4, GRA-1/4-B, GR-3/8-B, GR-1/2,
GR-3/4: Steel
2 Regulating screw GR-M3, GRA-1/4-B, GR-3/8-B, GR-1/2,
GR-3/4: Brass
GR-M5-B, GR-M5X2-B, GR-1/8-B,
GR-1/8X2-B: High-alloy steel
GR-1/4: Galvanised steel
3 Housing GR-M3, GR-M5-B, GR-M5X2-B, GR-1/8-B,
GR-1/8X2-B, GR-1/4, GR-3/4: Wrought
aluminium alloy
GRA-1/4-B, GR-3/8-B, GR-1/2:
Die-cast zinc
– Seals Nitrile rubber
Note on materials RoHS compliant
2
3
1
Subject to change – 2019/056 � Internet: www.festo.com/catalog/...
One-way flow control valves GR/GRA, in-line installationTechnical data – Female thread, metal
Dimensions Download CAD data � www.festo.com
GR-M3
Dimensions Download CAD data � www.festo.com
GR-M5-B, GR-1/8-B
-H- Note: This product conforms to ISO 1179-1 and to ISO 228-1
1 Cover cap GRK � 10
2 Hex nut GRM � 10
Type Connection B1 D2 D3 D4 H1 H2 H3 H4 H5 H6 H7
max.
L1 L2 ß 1 ß 2
D1 min. max. ±0.1
GR-M5-B M5 14 4.3 M10x1 8 35 41 25.2 16 12.5 7 4.7 2.5 26 18 13 8
GR-1/8-B Gx 16 4.3 M12x1 8 40.6 46.5 30.8 22 17.5 9.2 9 3.5 32 24 14 8
2019/05 – Subject to change 7� Internet: www.festo.com/catalog/...
One-way flow control valves GR/GRA, in-line installationTechnical data – Female thread, metal
Dimensions Download CAD data � www.festo.com
GR-M5X2-B
-H- Note: This product conforms to ISO 1179-1 and to ISO 228-1
Cover cap GRK � 10
Hex nut GRM � 10
GR-1/8X2-B
-H- Note: This product conforms to ISO 1179-1 and to ISO 228-1
Cover cap GRK � 10
Hex nut GRM � 10
Type Connection B1 D2 D3 D4 H1 H2 H3 H4 H5
D1 min. max.
GR-M5X2-B M5 14 4.7 +0.1 M10x1 8 38 43.5 31.7 19 15.5 –
GR-1/8X2-B Gx 16 3.8 +0.1 M12x1 8 40.6 46.2 34.3 22 18 4
Type H6 H7 H8 H9 L1 L2 L3 L4 L5 ß 1 ß 2
GR-M5X2-B 10 3.5 4.5 3.2 41 +0.5 33 +0.2 – 16 +0.2 – 13 8
GR-1/8X2-B 14 3.5 4.5 2.8 53 +0.5 22.5 ±0.15 4 19 ±0.15 17 14 8
Subject to change – 2019/058 � Internet: www.festo.com/catalog/...
One-way flow control valves GR/GRA, in-line installationTechnical data – Female thread, metal
Dimensions Download CAD data � www.festo.com
GR-1/4
Type Connection B1 D2 D3 H1 H2 H3 L1 L2 L3 ß 1
D1
GR-1/4 G¼ 28 18 16 32.5 26.5 17 52 30 22 24
Dimensions Download CAD data � www.festo.com
GRA-1/4-B GR-3/8-B
-H- Note: This product conforms to ISO 1179-1 and to ISO 228-1
1 Cover cap GRK � 10 2 Hex nut GRM � 10
Type Connection B1 D2 D3 D4 H1 H2 H3 H4 H5 H6 H7
max.
H8 L1 L2 ß 1 ß 2
D1 min. max.
GRA-1/4-B G¼ 26.5 M20x1.5 6.4 17.4 56 62 73.5 44 22.5 28 10 3.5 – 52 35 ±0.1 13 24
GR-3/8-B Gy 33 M20x1.5 4.5 17.5 62.5 74 76.5 46 31.5 27 14 3.5 13 62 38 13 30
2019/05 – Subject to change 9� Internet: www.festo.com/catalog/...
One-way flow control valves GR/GRA, in-line installationTechnical data – Female thread, metal
Dimensions Download CAD data � www.festo.com
GR-1/2 GR-3/4
-H-Note: This product conforms to ISO 1179-1 and to ISO 228-1 -H-Note: This product conforms to ISO 1179-1 and to ISO 228-1
Ordering data – One-way flow control function
Pneumatic
connection
Standard nominal flow rate qnN
at 6 bar > 5 bar
Standard flow rate qn
at 6 bar > 0 bar
Weight Part No. Type
In direction of
flow control
In non-return
direction
In direction of
flow control
In non-return
direction
2 1 [l/min] [l/min] [l/min] [l/min] [g]
Knurled screw
M3 M3 29.5 26 … 27.5 – – 2.5 15899 GR-M3
M5 M5 115 130 … 137 – – 19 151213 GR-M5-B
Gx Gx 210 180 … 275 – – 31 151215 GR-1/8-B
G¼ G¼ 420 780 – – 180 6509 GRA-1/4-B
Gy Gy 1010 1150 – – 225 6308 GR-3/8-B
G½ G½ 1620 2760 – – 517 3720 GR-1/2
G¾ G¾ 3300 4800 – – 938 2103 GR-3/4
G¼ G¼ 370 150 570 340 80 2101 GR-1/4
M5 M5 95 75 – – 37 152611 GR-M5X2-B
Gx Gx 205 190 – – 54 152612 GR-1/8X2-B
Subject to change – 2019/0510 � Internet: www.festo.com/catalog/...
One-way flow control valves GR/GRA, in-line installationAccessories
Hex nut GRM
For front panel mounting
Material: Steel
Ordering data
For type Description Part No. Type
GR-M5-B, GR-M5X2-B Thread M10x1 6444 GRM-M5
GR-1/8-B, GR-1/8X2-B Thread M12x1 2107 GRM-1/8
GRA-1/4-B, GR-3/8-B Thread M20x1.5 204596 GRM-3/8
Cover cap GRK
Material: PP
Ordering data
For type Description Part No. Type
GR-M5-B, GR-M5X2-B Thread M10x1 6436 GRK-M5
GR-1/8-B, GR-1/8X2-B Thread M12x1 2105 GRK-1/8
GRA-1/4-B, GR-3/8-B Thread M20x1.5 6309 GRK-3/8-B
2019/05 – Subject to change 11� Internet: www.festo.com/catalog/...
One-way flow control valves GR, in-line installationTechnical data – Push-in connector QS, polymer
One-way flow control valve GR -M- Flow rate
85 … 265 l/min
-Q- Temperature range
–10 … +60 °C
-L- Operating pressure
0.2 … 10 bar
General technical data
Valve function One-way flow control function
Pneumatic connection 2 QS-3 QS-4 QS-6 QS-8
Pneumatic connection 1 QS-3 QS-4 QS-6 QS-8
Adjustment component Knurled screw
Type of mounting Via through-hole
Front panel mounting
Via accessories
Mounting position Any
Operating and environmental conditions
Operating pressure [bar] 0.2 … 10
Operating medium Compressed air in accordance with ISO 85731:2010 [7:4:4]
Note on operating/pilot medium Operation with lubricated medium possible (in which case lubricated operation will always be required)
Ambient temperature [°C] –10 … +60
Temperature of medium [°C] –10 … +60
Storage temperature [°C] –10 … +40
Subject to change – 2019/0512 � Internet: www.festo.com/catalog/...
One-way flow control valves GR, in-line installationTechnical data – Push-in connector QS, polymer
Standard nominal flow rate qnN at 6 > 5 bar
as a function of turns of the adjusting screw n
Standard flow rate qn at 6 > 0 bar
as a function of turns of the adjusting screw n
GR-QS-3, GR-QS-4 GR-QS-3, GR-QS-4
GR-QS-3
GR-QS-4
GR-QS-6, GR-QS-8 GR-QS-6, GR-QS-8
GR-QS-6
GR-QS-8
Materials
Sectional view
One-way flow control valve
1 Adjusting screw High-alloy steel
2 Housing PA, reinforced
3 Releasing ring POM
– Seals NBR
Note on materials RoHS-compliant
1
2
3
2019/05 – Subject to change 13� Internet: www.festo.com/catalog/...
One-way flow control valves GR, in-line installationTechnical data – Push-in connector QS, polymer
Dimensions Download CAD data � www.festo.com
Knurled screw
1 Cover cap GRK � 14
2 Hex nut GRM � 14
Type Tubing O.D.
D1
B D2 D3 D4 H1 H2 H3 H4
min. max.
GR-QS-3 3 14 M10x1 4.3 ±0.1 7.9 –0.3 35 41.5 5.55 12.2 15.7
GR-QS-4 4 14 M10x1 4.3 ±0.1 7.9 –0.3 35 41.5 5.55 12.2 15.7
GR-QS-6 6 16 M12x1 4.3 ±0.1 7.9 –0.3 40 46 8.4 17.3 21.3
GR-QS-8 8 16 M12x1 4.3 ±0.1 7.9 –0.3 40 46 8.4 17.3 21.3
Type H5 H6 H7 H8 H9 H10 L1 L2 L3 ß 1 ß 2
max.
GR-QS-3 24.9
4.5 3.5
3.2 2.5 50.9 41.8 36 18
8
13
GR-QS-4 24.9 3.2 2.5 50.9 42.4 36 18 13
GR-QS-6 30.1 2.8 3.5 46.1 51.6 43 24 14
GR-QS-8 30.1 2.8 3.5 46.1 53.4 43 24 14
Ordering data – One-way flow control function
Pneumatic
connection
Standard nominal flow rate qnN at 6 > 5 bar Weight Part No. Type
in direction of flow control in non-return direction
2 1 [l/min] [l/min] [g]
Knurled screw
QS-3 QS-3 85 120 12 193965 GR-QS-3
QS-4 QS-4 110 165 12 193967 GR-QS-4
QS-6 QS-6 245 430 22 193969 GR-QS-6
QS-8 QS-8 265 500 23 193970 GR-QS-8
Subject to change – 2019/0514 � Internet: www.festo.com/catalog/...
One-way flow control valves GR, in-line installationAccessories
Retainer GR-H
For mounting on a flat surface via M3
screws. The one-way flow control valve
is snapped into the retainer. The
retainer can be fitted in any position.
Material: POM
Free of copper and PTFE
Linking of multiple retainers via
dovetail slot
Dimensions and ordering data
For type B B1 D D1 D2 H H1 H2
GR-QS-3, GR-QS-4 14.3 1.9 9 3.2 6 16 12 5.7
GR-QS-6, GR-QS-8 19.8 1.9 14.5 3.2 6 19.2 13 5.7
For type H3 H4 L L1 Weight Part No. Type
[g]
GR-QS-3, GR-QS-4 4.1 3.4 31.8 24 4 195495 GR-H-QS-3-4
GR-QS-6, GR-QS-8 2.3 3.4 31.8 24 5 195496 GR-H-QS-6-8
Hex nut GRM
For front panel mounting
Material: Steel
Ordering data
For type Description Part No. Type
GR-QS-3, GR-QS-4 Thread M10x1 6444 GRM-M5
GR-QS-6, GR-QS-8 Thread M12x1 2107 GRM-1/8
Cover cap GRK
Material: PP
Ordering data
For type Description Part No. Type
GR-QS-3, GR-QS-4 Thread M10x1 6436 GRK-M5
GR-QS-6, GR-QS-8 Thread M12x1 2105 GRK-1/8
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